【摘 要】
：
Enhancement of the surface quality of hardened cementitious material is critical for achieving an improved durability of the concrete structure.In this paper, the authors try to present a systematic d
【机 构】
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School of Materials Science & Engineering, University of Jinan, Jinan, Shandong, 250022, China;Shand
【出 处】
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The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
Enhancement of the surface quality of hardened cementitious material is critical for achieving an improved durability of the concrete structure.In this paper, the authors try to present a systematic discription of their investigations on the surface-treatment of hardened cementitious materials with nano-SiO2.Based on the discussion on the intrisic properties of nano-SiO2, especially its penetration capability into capillary pores and the pozzolanic reactivity, colloidal nano-SiO2 and its precursor, TEOS, were used for surface treatment.Results demonstrated that although the mechancial property of hardened cementitious materials can be hardly affect by surface-treatment, its corrision-resistance, i.e., sulfate attack resistance and calcium ion-leaching resistance, can be improved by physical or chemical effect.The in-depth investigation reveals that the refinement of the pore structure of hardened cementitious materials at the surface, as well as the optimization of the C-S-H gel due to the in-situ pozzolanic reaction with the cement hydration products, expaically in the TEOS-treated samples, can be ascribed to the quality enhancement.
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